Metallurgical filter.



Patented July I7, |900. F. H. LONG.

METALLURGICAL FILTER.

(Application led Nov. 6, 1899.)

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No. 653,684. Patented July I7, |900. F. H. LONG.

METALLURGICAL FILTER.

(Application filed Nov. 8, 1899.)

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UNTTED STATES PATENT Orman.

FREDERIC H. LONG, OF CHICAGO, ILLINOIS, ASSIGNOR TO ROSS J. BEATTY,

TRUSTEE, OF MUNCIE, INDIANA. Y

METALLURGICAL FILTER.

SPECIFICATION forming part of Letters Patent No. 653,684, dated J' uly1'7, 1900.

Application led November 6, 1.899.` Serial No. 736,008. lllo model.)

To @ZZ whom it 717/601/ concern:

Be it known that I, FREDERIC H. LONG, a resident of Chicago, Cookcounty, Illinois, have invented certain neT and useful Improvements inMetallurgie Filters, of which the following is a full, clear, and exactdescription.

In Wet methods for extracting metals from their ores by aid of propersolvents the refuse gangue left at the close of the extraction stagenecessarily retains a notahlepercentage of rich solution. Under carefulwashing and filtration of the gangue this associated solution isoftentimes'recovered and utilized.

The present invention seeks to provide an apparatus primarily suited forrapid treatment of the refuse gangue, a charge thereof, together withthe residual solution which accompanies it, being repeatedly Washedunder hydrostatic pressure to promote rapid filtration of the solution,while the charge is maintained in active circulation to insure thoroughcleansing, and as Well to prevent banking of the dense slimes againstthe filter medium or septum.

The nature of the invention will appear in detail from the descriptionfollowing and be thereafter more particularly pointed out by claims atits conclusion.

On the drawings like parts bear like designation throughout.

Figure 1 displays one form of the improved apparatus in longitudinalvertical section; Fig. la, a plan view of the filter-hopper detached andinverted; Fig. 1b, a detaillongitudinal section view of the pump-plungerand its rod; Fig. 1C, a top View of the plunger and its Valve-cage; Fig.2, another form of the ap paratus in longitudinal section, the externalpump and the pipe connections being shown in elevation; Fig. 2", adetail front View of the centrifugal pump, Fig. 2.

In the device shown by Fig. 1 the lter vessel comprises a body 10, withhead 11 and sloping bottom 12, all of sheet metal. The body and head arepermanently riveted or otherwise fastened together, whereas the slopingbottom detaches from the body, but is anged, as shown, and tightlybolted in place at the edge ring 4:1 Wood lining 13 protects the`-vessel interior from corrosion.

For the purpose of agitating the charge, so as to thoroughly expose itto the rinsing effect of the Wash Water, the vessel is furnished With aninternal pump mechanism properly arranged to compel a forced circulationof the vessel contents. The pump acts to prevent banking of the slimes,and thus keeps the filter clean for persistent separation andremovaloftheclearliquid. An uprightwooden 6o penstock 14, withstrengthening-hoops set at intervals thereon, rests upon the inturnededge of metal bottoml2, gasket 9U being interposed to close the joint,While space-rings 89 91, in conjunction with the filter-hopper 85, 65

afford a step-bearing to steady the penstock in place. At its top thepenstock centers about the ledge of a depressed cap 1G, seated in a holeof head 11. rThe flange of cap 16 sustains the feet of cross-head 17,both parts 7o being secured in common by bolts 18 to the top of thevessel. Cross-head 19, carried by guide 17, receives its motion as bypitman 20 and wheel 2l, thus reciprocating the plungerrod 22, whichpasses through stuffing-box and gland 23 at cap 16 and by its lower endsustains the pump-plunger 24.

As seen at Fig. 1b,tne reciprocating pumprod consists of a wooden sheath22, incasing a central metal stem 25, fastened above by 8o nut 26 tocross-head 19 and by gutta-percha nut 27 beneath to plunger 24, made oflike material. Rubber gaskets 28 encircle stem 25'at the severaljointsto exclude liquid.

`Threaded Within plunger-24 is the gutta-per- 85 cha cage 29, upon whichseats the gutta-percha valve 30. A gutta-percha liner 31, fastened topenstock 114, affordssnug bearing for the packing of plunger 2i.V ThelinereX- tends below pastthe' inturned edge of metal 9o bottom 12 andaids in centering and steadyingthepenstock beneath. IIard-ru'bbervalve dseats against Wooden liner 35, which in conjunction With companiongiitta-percha liner 36 acts to protectthe metal-exit 37 bolted to 95bottom 12.

The sloping bottom 12 detachee, as by bolts 41, from the body of thefilter to afford access to hopper S5, sustained out of contact with thesurface of bottom 12 by Wooden suploo ports S6. Hopper is perforated, asshown, and carries a cotton-duck or canvas cover 87,

stretched in place by rim-hoop 8 8 above and by space-ring 89,. inturnedlip of bottom 12, and lower terminal of penstock 14 beneath.

Outlet-pipe g, controlled by cock or valve, aords a regulated exit forthe accumulated filtrate. The gangue or other material to be treated issupplied at intervals through feed.- pipef. A vent-pipe f2 enables theconfined air or gases to escape at the inflow of the charge or later onduring the run. The pipe is ordinarily closed by suitable cock, so thatthe vessel being completely filled with the semiliquid charge com pactlyconfines its contents, eXcept for ventage of the filtrate at outlet g,while the wash-Water acts in hydrostatic column to exert its pressure inaid of rapid filtration. For such purpose the water-supply pipe 8O isfastened into the top of the vessel and leads thence overhead to someconvenient storage-tank (not shown) or other reservoir. Valve 82 andcock 83 govern the inflow, and are thus employed in duplicate, so thatshould either one become disarranged the other may then be caused to actinstead for sh uttingo or regulating the feed. Main valve 84 admitsWater to pipe 8O or else can be used to drain thestorage-reservoirthrough waste tap-pipe 80a should the cock therein be left open for thepurpose.

For agitating and circulating the slimes during 'filtration the pump canbeinternal or else, as shown at Fig. 2, may be arranged Outside of thefilter vessel, although in closed Connection therewith. The externallocation of the pump renders it easily accessible and, besides, enablesthe pump to quickly empty the vessel of its contents. Many of the partsalready described appear again at Fig. 2 and need not be dwelt uponfurther.

The casing A of the centrifugal pump attaches at its inlet-eye to theelbow-pipe d. which is tightly secured at the apex of the vessel bottomand opens t-hereinto just above the filter. The exit-port of the pumpconnects with return-pipe b, which latter rises externally up to the topof the vessel and is united for convenience to the gangue-feed plpef- Toprevent seepage and as well to allow for easy rotation of the pumpdespite the hydrostatic pressure, the enlarged journal-box c for thepump-axle is fitted with a tube c', which extends upward for a distanceapproximately equal in height to the column of wash- Water deliveringinto the filter vessel. By such expedient the pressures at oppositefaces of the pump are substantiallyneutralized and thev rotation thereofremains unirnpeded by side thrust and resultant. friction.

The pump Works in familiar fashion, constantly withdrawing the mixedslimes and liquid from the vessel'bottom and delivering them anew intothe top, maintainingthe.'

charge in a constant state of ux and agit-ation,while the wash-Wateracts under pressure to cleanse the solids and to force the liquid pastthe iilter and out at exit g. On opening cock 100 and closing cock lOlthe continued rotation of the pump speedily empties the vessel of itscontents, the refuse being directed into any convenient Waste tank ordump. Cock 102 is merely supplemental and ordinarily remains closedWhile the pump is in action.

NVhile the apparatus is primarily designed for treatment of metallurgiegangues, it may be used to advantage in Washing paper-pulp or other likematerials in semiliquidsuspension. The details of structure can bevaried by the mechanics skill Without departure from the essentials ofthe improvement.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The combination with the closed vessel having a filter-septum and anoutlet-port for the liltrale beyond such septum, of the Washwater pipeconnected in hydrostatic column with said vessel and suitable means forestablishing a forced circulation of the Vessel contents, substantiallyas described.

2. The combination with the closed vessel having a filter-septum and aregulated outletport for the liltrate beyond such sept-um, of thewash-water pipe connected in hydrostatic column with said vessel and theexternal centrifugal pump joined at its separate sides in closed unionwith the opposite ends of the Vessel, substantially as described.

3. The combination with the closed vessel having a filter-septum and aregulated outletport for the filtrate beyond such septum, of theWash-water pipe connected in hydrostatic column with said. vessel and.the external centrifugal pump joined at its separate sides in closedunion with the opposite ends of the vessel; the journal-box for saidpump-axle being furnished with a water-column pipe to counterbalance thehydrostatic pressure at the vessel, substantially as described.

FREDERIC H. LONG.

Tituessesz Louis M. GREELEY, JAMES H. PEIRCE.

